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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
REM sleep. About ten minutes, brain waves become rapid, heart rate rises and breathing accelerates, eyes constantly dart around, become sexually aroused, muscles are relaxed so person is essentially paralyzed, cannot be easily awaken, internally aroused but externally calm, time of dreaming. Length of Sleep Stage 1.